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Control of Whispering Gallery Modes and PT-Symmetry Breaking in Colloidal Quantum Dot Microdisk Lasers with Engineered Notches

https://doi.org/10.1021/acs.nanolett.9b01914

Zeng, Qingji ; Lafalce, Evan ; Lin, Chun Hao ; Smith, Marcus J. ; Jung, Jaehan ; Yoon, Young ; Lin, Zhiqun ; Tsukruk, Vladimir V. ; Vardeny, Z. Valy ( August 2019 , Nano Letters)

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Light-enabled reversible self-assembly and tunable optical properties of stable hairy nanoparticles

https://doi.org/10.1073/pnas.1714748115

Chen, Yihuang ; Wang, Zewei ; He, Yanjie ; Yoon, Young Jun ; Jung, Jaehan ; Zhang, Guangzhao ; Lin, Zhiqun ( February 2018 , Proceedings of the National Academy of Sciences)
Hairy Uniform Permanently Ligated Hollow Nanoparticles with Precise Dimension Control and Tunable Optical Properties

https://doi.org/10.1021/jacs.7b04545

Chen, Yihuang ; Yang, Di ; Yoon, Young Jun ; Pang, Xinchang ; Wang, Zewei ; Jung, Jaehan ; He, Yanjie ; Harn, Yeu Wei ; He, Ming ; Zhang, Shuguang ; et al ( September 2017 , Journal of the American Chemical Society)

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Enabling Tailorable Optical Properties and Markedly Enhanced Stability of Perovskite Quantum Dots by Permanently Ligating with Polymer Hairs

https://doi.org/10.1002/adma.201901602

Yoon, Young Jun ; Chang, Yajing ; Zhang, Shuguang ; Zhang, Meng ; Pan, Shuang ; He, Yanjie ; Lin, Chun Hao ; Yu, Shengtao ; Chen, Yihuang ; Wang, Zewei ; et al ( June 2019 , Advanced Materials)

Abstract
Instability of perovskite quantum dots (QDs) toward humidity remains one of the major obstacles for their long‐term use in optoelectronic devices. Herein, a general amphiphilic star‐like block copolymer nanoreactor strategy for in situ crafting a set of hairy perovskite QDs with precisely tunable size and exceptionally high water and colloidal stabilities is presented. The selective partition of precursors within the compartment occupied by inner hydrophilic blocks of star‐like diblock copolymers imparts in situ formation of robust hairy perovskite QDs permanently ligated by outer hydrophobic blocks via coprecipitation in nonpolar solvent. These size‐ and composition‐tunable perovskite QDs reveal impressive water and colloidal stabilities as the surface of QDs is intimately and permanently ligated by a layer of outer hydrophobic polymer hairs. More intriguingly, the readily alterable length of outer hydrophobic polymers renders the remarkable control over the stability enhancement of hairy perovskite QDs.

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